scholarly journals PENENTUAN STABILITAS SEDIAAN KRIM TABIR SURYA DARI BAHAN EKSTRAK RIMPANG KENCUR (Kaempferia galanga L.)

2005 ◽  
Vol 10 (2) ◽  
pp. 103-105
Author(s):  
Widji Soeratri ◽  
Noor Ifansyah ◽  
Diana Fitrianingrum
Keyword(s):  
Chemical Stability ◽  
Room Temperature ◽  
Percolation Method ◽  
Kaempferia Galanga ◽  
Oil In Water ◽  
Water Base

The objective of this research was to know the chemical stability of the etil para-metoksi sinamat (EPMS) formulated in sunscreen cream of oil in water base. The EPMS was isolated from Kaempferia galanga L. tuber pulvis with maceration-percolation method using ethanol 96 percent. The chemical stability of the EPMS formulated in sunscreen cream of the oil in water base was investigated by keeping the cream at room temperature. At appropriate interval the concentration of EPMS in cream was measured. The results showed that the EPMS formulated in sunscreen cream of oil in water base was unstable at room temperature for 70 days. The concentration of EPMS in cream significantly decreased after 70 days (p = 0,01) during keeping at room temperature with the coefficient degradation value (k)= 4.4.10-3/day.

Palonosetron HCl Compatibility and Stability with Doxorubicin HCl and Epirubicin HCl During Simulated Y-Site Administration

2005 ◽  
Vol 39 (2) ◽  
pp. 280-283 ◽  
Author(s):  
Lawrence A Trissel ◽  
Yanping Zhang
Keyword(s):  
Receptor Antagonist ◽  
Chemical Stability ◽  
Drug Concentration ◽  
Room Temperature ◽  
Visual Inspection ◽  
Physical Stability ◽  
Chemotherapy Drugs ◽  
Ambient Room Temperature ◽  
Physical And Chemical ◽  
Anthracycline Chemotherapy

BACKGROUND: Palonosetron HCl is a selective 5-HT3 receptor antagonist used for the prevention of chemotherapy-induced nausea and vomiting. Palonosetron HCl may be administered with other drugs by Y-site administration, including doxorubicin HCI and epirubicin HCI. Consequently, stability and compatability information are needed to verify the acceptability of such Y-site administration. OBJECTIVE: To evaluate the physical and chemical stability of undiluted palonosetron HCl 50 μg/mL with doxorubicin HCl 1 mg/mL and epirubicin HCl 0.5 mg/mL during simulated Y-site administration. METHODS: Triplicate samples of palonosetron HCl with each of the anthracycline chemotherapy drugs were tested. Samples were stored and evaluated for up to 4 hours at room temperature near 23°C. Physical stability was assessed using turbidimetric and particulate measurement, as well as visual inspection. Chemical stability was assessed by HPLC. RESULTS: All of the admixtures were clear and red—orange when viewed in normal fluorescent room light and with a Tyndall beam. Measured turbidity and particulate content were low initially and remained low throughout the study. The drug concentration was unchanged in any of the samples throughout the study. CONCLUSIONS: Palonosetron HCl is physically and chemically stable with doxorubicin HCl and epirubicin HCl during simulated Y-site administration of these drugs over 4 hours at ambient room temperature.

Materials for All-Solid-State Lithium Ion Batteries

2013 ◽  
Vol 1496 ◽  
Author(s):  
Sumaletha Narayanan ◽  
Lina Truong ◽  
Venkataraman Thangadurai
Keyword(s):  
Ionic Conductivity ◽  
Chemical Stability ◽  
Room Temperature ◽  
Lithium Ion ◽  
Ion Conductivity ◽  
High Ionic Conductivity ◽  
Li Ion Batteries ◽  
Li Battery ◽  
Li Ion ◽  
Very High

ABSTRACTGarnet-type electrolytes are currently receiving much attention for applications in Li-ion batteries, as they possess high ionic conductivity and chemical stability. Doping the garnet structure has proved to be a good way to improve the Li ion conductivity and stability. The present study includes effects of Y- doping in Li5La3Nb2O12 on Li ion conductivity and stability of “Li5+2xLa3Nb2-xYxO12” (0.05 ≤ x ≤ 0.75) under various environments, as well as chemical stability studies of Li5+xBaxLa3-xM2O12 (M = Nb, Ta) in water. “Li6.5La3Nb1.25Y0.75O12” showed a very high ionic conductivity of 2.7 х 10−4 Scm−1 at 25 °C, which is comparable to the highest value reported for garnet-type compounds, e.g., Li7La3Zr2O12. The selected members show very good stability against high temperatures, water, Li battery cathode Li2CoMn3O8 and carbon. The Li5+xBaxLa3-xNb2O12 garnets have shown to readily undergo an ion-exchange (proton) reaction under water treatment at room temperature; however, the Ta-based garnet appears to exhibit considerably higher stability under the same conditions.

Effect of Various Curing Agents On the Chemical Stability of Epoxy Resins

CORROSION ◽  
1961 ◽  
Vol 17 (1) ◽  
pp. 11t-20t ◽  
Author(s):  
RONALD L. DeHOFF
Keyword(s):  
Molecular Weight ◽  
Chemical Stability ◽  
Epoxy Resins ◽  
Room Temperature ◽  
Low Molecular Weight ◽  
Curing Agent ◽  
Corrosion Prevention ◽  
Curing Agents ◽  
Outdoor Weathering ◽  
Better Than

Abstract The epoxy resins most widely used in corrosion prevention are liquids of low molecular weight which can be converted to hard, tough, chemically resistant polymers by the use of various curing agents. Unlike other thermosetting resins such as polyesters, the curing agents may produce chemical linkages in the final polymers that differ from those present in the uncured form. Hence, the properties of cured epoxy resins are likely dependent upon, and may even reflect the properties of the curing agent used. Some seven different epoxy resin systems were exposed to various chemical environments and evaluatd for changes in dimensional stability and flexural strengths over a six month period. From the data presented herein, only limited conclusions may be drawn. Heat cured systems fare better than room temperature cured systems in every case. Anhydride cured epoxy resins show greater resistance to outdoor weathering than amine cured systems. 5.4.5, 6.6.8

Stability and Compatibility of Cimetidine Hydrochloride and Aminophylline in Dextrose 5% in Water Injection

1988 ◽  
Vol 22 (7-8) ◽  
pp. 592-593 ◽  
Author(s):  
Richard J. Baptista ◽  
Francis P. Mitrano
Keyword(s):  
Chemical Stability ◽  
High Performance ◽  
Room Temperature ◽  
Color Change ◽  
Water Injection ◽  
Controlled Study ◽  
Time Interval ◽  
Direct Sunlight ◽  
Control Solution ◽  
And Control

A controlled study was conducted to assess the physical compatibility of cimetidine hydrochloride (HCl) and aminophylline and the chemical stability of an admixture of the two medications in dextrose 5% in water (D5W) injection, over 48 hours at room temperature. Three one-liter admixtures were prepared, each containing cimetidine HCl 1200 mg and aminophylline 500 mg in D5W. One liter of only cimetidine HCl 1200 mg in D5W and one liter of only aminophylline 500 mg in D5W served as controls. Samples drawn from the five admixtures and immediately frozen were analyzed for cimetidine and theophylline content at times 0, 1, 6, 24, and 48 hours using high-performance liquid chromatography. Chemical stability of each drug was assessed relative to its time-zero concentration. Samples were also drawn from each test and control solution at every time interval to assess the pH. Admixtures were stored at room temperature out of direct sunlight for the duration of the study, and were visually inspected for color change, turbidity, cloudiness, and precipitation. Recovery of cimetidine and theophylline at all test intervals, pH assessments, and visual inspections of the admixtures showed that cimetidine HCl and aminophylline are both chemically stable and physically compatible for 48 hours at room temperature in one liter of D5W.

Physical and Chemical Stability of Gum Arabic-Stabilized Conjugated Linoleic Acid Oil-in-Water Emulsions

2013 ◽  
Vol 61 (19) ◽  
pp. 4639-4645 ◽  
Author(s):  
Xiaolin Yao ◽  
Qiong Xu ◽  
Dazhi Tian ◽  
Nana Wang ◽  
Yapeng Fang ◽  
...  
Keyword(s):  
Linoleic Acid ◽  
Conjugated Linoleic Acid ◽  
Chemical Stability ◽  
Gum Arabic ◽  
Acid Oil ◽  
Oil In Water ◽  
Physical And Chemical

scholarly journals Use of solid dispersions to increase stability of dithranol in topical formulations

2014 ◽  
Vol 50 (3) ◽  
pp. 583-590 ◽  
Author(s):  
Marilene Estanqueiro ◽  
Jaime Conceição ◽  
Maria Helena Amaral ◽  
José Manuel Sousa Lobo
Keyword(s):  
Room Temperature ◽  
Light Exposure ◽  
Solid Dispersions ◽  
Color Space ◽  
Physical And Mechanical Properties ◽  
Textural Analysis ◽  
Oil In Water ◽  
Glyceryl Behenate ◽  
Pure Drug ◽  
The Stability

The present study was planned to improve the stability of dithranol using solid dispersions (SD). Two different SD at a 1:9 ratio of dithranol/excipient were prepared: one of them using glyceryl behenate as excipient and the other using a mixture of argan oil with stearic acid (1:8 ratio) as excipient. Pure dithranol and SD of dithranol were incorporated in an oil-in-water cream and in a hydrophobic ointment in a drug/dermatological base ratio of 1:10. The physical and mechanical properties of semisolid formulations incorporating the pure drug and the developed SD were evaluated through rheological and textural analysis. To evaluate the stability, L*a*b* color space parameters of SD and semisolid formulations, and pH of hydrophilic formulations were determined at defined times, during one month. Each sample was stored at different conditions namely, light exposure (room temperature), high temperature exposition (37 °C) (protected from light) and protected from light (room temperature). Despite higher values of firmness and adhesiveness, hydrophobic ointment exhibited the best rheological features compared to the oil-in-water cream, namely a shear-thinning behavior and high thixotropy. These formulations have also presented more stability, with minor changes in L*a*b* color space parameters. The results of this study indicate that is possible to conclude that the developed SD contributed to the increased stability of dithranol.

Stability of Mycophenolate Mofetil as an Extemporaneous Suspension

1998 ◽  
Vol 32 (7-8) ◽  
pp. 755-757 ◽  
Author(s):  
Raman Venkataramanan ◽  
Jacqueline R McCombs ◽  
Sheila Zuckerman ◽  
Bill McGhee ◽  
Jaya Pisupati ◽  
...  
Keyword(s):  
Mycophenolate Mofetil ◽  
Chemical Stability ◽  
Mycophenolic Acid ◽  
Postoperative Period ◽  
Dosage Form ◽  
Room Temperature ◽  
Pediatric Patients ◽  
Early Postoperative Period ◽  
Time Points ◽  
Physical And Chemical

OBJECTIVE: To evaluate the physical and chemical stability of a suspension of mycophenolate mofetil (MMF) prepared in the hospital from commercially available MMF capsules. METHODS: Suspensions of MMF were prepared at room temperature and stored at 5, 25, 37, and 45 °C over a period of 50 to 210 days. The contents of MMF and its degradation product, mycophenolic acid, in the suspension were measured at various time points by HPLC. RESULTS: MMF suspensions were stable (as determined by the presence of ≥90% of the labeled amount) at 45 °C for at least 11 days, at 37 °C for at least 28 days, at 25 °C for at least 28 days, and at 5 °C for at least 210 days. The suspension was also physically stable at 5 °C during the entire test period. CONCLUSIONS: The compounded MMF suspension was stable for at least 11 days at all the temperatures studied and for as long as 210 days at 5 °C. This formulation appears to be clinically acceptable and provides a convenient dosage form for pediatric patients and for adults during the early postoperative period.

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